The CSV format of this 3.1 invoice output tax was created because the format previously created in the 3.0 invoice did not match (error) when it was imported in the 3.1 invoice. This is because in Efaktur 3.1 it turns out that there is an additional column so that the output Tax CSV Format must be made according to the format in Efaktur 3.1. Note: Invoice 3.1 output tax CSV format cannot be imported in Efaktur 3.0 and vice versa in Efaktur 3.0 CSV format cannot be imported in Efaktur 3.1. As usual, the explanation of this video is explained in a simple way, so it's definitely easier to follow the tutorial. Hope the video is useful.